Trying to decide what type of portable exercise bike to buy can be difficult because there is so many different types to choose from. First off, make sure the machine has different setting levels of resistance. Being able to vary the patterns of the machine will help you get a better workout. In addition, the machine should be light weight and easily movable to do other body part workouts such as the arms. Portable bikes have different purposes for each individual, from weight loss to curing boredom. Always try to choose one that has software that can help you track your workouts over time. Staying excited about your workouts come from actually seeing the effort over time, so make sure to keep track.